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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d25b910eeec504596b7d913b0f2be8ebe69bc4fb84b4a8f916026f4f03227c' 
  AND token = 'Qr4RRJgHnR2BLE3VYk3Qy5fegT2iJw60PXaixNASp90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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