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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e509a6048294d6dc52118d9b4d716ab98ec826b0b18b59c3d65a41718debeafe' 
  AND token = '9uScE93MjRU3q1CwC/iWt30KBBsNm1XTVAuA+b2X5fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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