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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f1c9db32d982b1cd5a633d5d8b4918c15506239fe86ebcc1138d7eeb9758ee' 
  AND token = 'YzvTRqg9+CK2H8R/UNWolMYnKUlXkCuEWeD5f4Wzld0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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