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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f9edc8c0509ac17ab35aa5d531b826afa78db16cdbb6a39015cfc927677353' 
  AND token = 'IrkIjlTr4U3dlSMhrkZ7/HoCson2kMF90qCo0Z77uN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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