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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc047fa64b95835b0dd1f799b18b701c9b4203e80e62d23d7b37be48671ded2' 
  AND token = 'a/aXxWdTMp5NKI+LgwGcJfg3HGJApogsHxiAI09s/oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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