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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbbd7b7ce55101204873e38b13ae422070822b32d6bef95594f2c085360ed7d' 
  AND token = 'pNKlvnZATvMicUDaVD307UweksN428Xna1Ga1KPJdYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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