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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84bb45f2e1f6fd1e1e410ab47f02b2d40d04b861f5250e72ad4bfe71de80e37' 
  AND token = 'eMLm2LQns2/c/xvCHfE3QXSqEkLLh7lfl5eT0DsPvA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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