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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17361d737b72509cdd5d22c5dc7ae8e31d3fd902d4239686a15c74a8cce5be26' 
  AND token = 'wVG4Owrv1tgZcVrzhlCoSUyTtG6flpi3eyWnhqfS6Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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