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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ebee654581b721ef43ed7af1abc4c3c65229065d7c78d091eb100f074663b9' 
  AND token = 'fvMqdqaXzj2cKVKd5chn6TpVMsBguXo2514/2JRKj8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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