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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4d825a65be4a8131e294ab9e051bf1cfd20d87818281fe5b7c2ab7ea6e8b73' 
  AND token = 'HdNOCx0A9xoC7HjAY77sG9feCSz1RIUxlfI7KfwHugM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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