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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5f4ad4ab7d6097f02e90e2f4fc6babf537118e26864c0ba6a4022aa320dc24' 
  AND token = 'AJD4yoVN3j2oBlHVQPkfKvyFrxccBqrFqM6mPt8T/rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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