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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1d7694a4becebec14abf783908d43f4e54e4155c99a4c40930891238ec0a27' 
  AND token = 'KS0Q6kNqaJH+GhXN7Okjr6HIYdtkobCH9xkEdNIdWAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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