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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b93323754b26b7501951fc7d475d767402763e0fd1fac4d108175ebf1f59e9' 
  AND token = 'bvSRF3UJAYgAXLf02KhKZe58thEUTgQrbQT1V2UGQzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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