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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3c583fd74f30cf353431e813b7de3365c6bd6a0559f7007509cdb985311cca' 
  AND token = 'Pal6DE6kogFLov6ZIF76KSKvgFjCALS/pXLeez3wKH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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