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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2fa7c90d175ecb2ab6eda5e9d09994ee8ebd1513b8335aa9ad7a6a361f313b' 
  AND token = 'wtP0Q1HZ8sIo3vN8u6PU5vpqumC1L3ggM6GsjoPFNZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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