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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b38ee04b3a1e3cbbdfc28b8b09d7f539a6189c2cae89f5a36f479af0c79b935' 
  AND token = '7UMLFC8M7L85vNzJz9LiKSXDCcd+acwaVMt3dFuPp50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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