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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314c067b31f2293012a62e3f8ac0e9fd20e1f84bb4b6b11e7bab48368347ba50' 
  AND token = '46oQe9VqnbrSXFNKx5iosiqP1tiJCPZudto8AvD4rCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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