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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d211759f833abede468c3cd7d51220e01689180c4fe725a9f7f3fabcbe097fe' 
  AND token = '9/y95ikaFJXPx/5eoAhnhQFf3YvOaSHNC/agyAWOmsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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