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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c65bb2e29ed06c5d8aac51527eb08d327cde2f465e0bea80ef97434bc96ff1eb' 
  AND token = '4iX5koIu5jRlyurvtxusN96EaKtE6slXHNMadbNTG+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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