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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bdce6b1be59e7b5e9e5fc0568f8f8914819688a7c15d43d75f07b4b251ef830' 
  AND token = 'ncGyGhkATWvsfA64o5upXvXjEV40jX/YGg1QjggaP2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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