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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46b2e0cdcb0475239f51c23c3c64e7afc17f4c01413cb83a5b4ffc59b9cfaf4' 
  AND token = '9H69YB3saLmpeLZCvWPhizb3JX+qdVe3PNNbSm+37y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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