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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801a3b519f8cb5b5ed9be762a99576ca650c38cb93e746fb8feb23356f566831' 
  AND token = 'vNcvW6hC7zZoqYM51GUGmA+FIaMIgTo7ht+cJS7baQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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