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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a87fb9e39afcb6475bb50026ccfc6043fdc82c309b8c710b820b547ad4a34e2' 
  AND token = 'rJ6FRYFCCsCVNvJ+RIl5l5wq7DkI6WVVqW7+SeKrA4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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