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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af11e7eb38a76c9970cbe632b8848f188ccdc2c423f1116ae7c560d7720c3a5' 
  AND token = 'iM6t1npihdwARUSZL9nllcR4/d6TofHWR21P1qCAvzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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