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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a13680befd5b31e45e91f4c9405f882e15b65d5fcda9327198262366945a49' 
  AND token = 'Rxt3oAIf8WgQVi0BVn5WX71x35sQTb1wHvGi/glkwVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}