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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce825074e453d07281de17a502596dbc27ae10a9cd1612b2af85b4d04e5a01f' 
  AND token = 'yCPlTsdNZ/m4YU3LfNdxfCGLXsOVD8wP50+3Ad/AYAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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