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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c6338d60b820a72d24502fea2c17db0124f4bb8d2a00aacb2c23d169025a62' 
  AND token = 'jRfzCfUkr9NFU+FwWzPWFt46c4FRjLD/koFT1ZnGcbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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