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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0824829e57acb9969a460b2dbd076fde586de587417a6dee3603f3f0b63d27f6' 
  AND token = 'gAo410TWuUkYQP1apIwwH77r88eGdRKIHUWxXBpC89g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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