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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d74dd8c88f98cb58d9fdf88d50a8a9f9b4a664a8c9508fb577e583edda0919' 
  AND token = 'MoRxPvbBXZjUVeQEtr3vR4Yu2z0Mkkwqe8EjIKTfTxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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