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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd672a02c21313ed4245d11ea23e3faebd2ffdc348395861c06bc191683ac2837' 
  AND token = 'jdoKcM/Le7Ck+OrQzXqn/NxC5LfE4ATTQtx8sahVRKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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