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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742b8b4960c9d250854173c09051fa9a3e50f657a991c7717d502fb5e7893f3b' 
  AND token = 'kHOZ7nCOx1ILxyv6AC4LPTd8wf9W2OosfK9qG3jFAXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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