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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc1f8c46c4b1f8e3e09bb6e6abd43f3c8b2d872d3c7d6579bdda1f908d21f1b' 
  AND token = 'WJpF2l54pMxZlyxv3XAqEyXVFX3N7/LcvWJvSn28cFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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