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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4b0f65dcba5d597db2d9d3360ed253adcc5f90b5b929a9ca0886c3dffb4afd' 
  AND token = '3hJzKrkJVEOVilsZ0I6SS9fC7D+dQMk0qALEbBUnPbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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