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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefca32b722659705061510ffe70eb8dd3124ccded42b37196636538657db242' 
  AND token = 'EjnufEi8lYiboIh8TOcbSlm3X6SoyQ75c5O5xVjC+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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