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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bf86ffea33ba4ba62a7358dec3d101d2da6f7cc91fec64f521c792bc411cbe' 
  AND token = 'sHeNLb21Yh6oFKj7LVOAfcJK6lCYCUyPfRZq9FLqVUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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