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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394fc4940a8217ce7cddb8229fdc38b87ffd1c753ed585227bc28d7aee8e7acc' 
  AND token = 'ebduzMUn8jxvi3u1Nl5S7ZMdzixJOR14/EqK6Nff+IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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