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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded5ba4c60c94725290a94d5d255f387d1424b8d40b92abc44a92da9976fd03a' 
  AND token = 'QO0OaYW6WMt0Db19BrY0ZJwB2YjNib+3DLURUdAnQaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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