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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96fb18ece1bf9975288943ea417cf7ce9da43aec2a27ed871338ae5d1e4c2053' 
  AND token = 'AgYu224i3J4khyMH/XkBTJ+gmVpSpXe/q2NXBHuH7KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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