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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799266e457b87aebad8b5064f667bca9b43c9c40c5f358b253eb167ddc243bec' 
  AND token = '3uWFUBN98+hoou+GGC9gAIfhNEmJqnn4OynouAlaPSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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