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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27472243b97c85cb56cee54d73f579b0413a56d438ceef2e9f724cf22c99dc3' 
  AND token = '34QpekFAw6av/VpeQ0Ycl78gOjlD+tDmtOa7xOPY6T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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