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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68ab1e8198bcbfe11a6a4de19d9033fa5550640dd3d353576598a5acccc67f1' 
  AND token = 'lVyaf5PJTfpIcljPVnLiOJyT/EipCwibkInQL+HPujo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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