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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc25b5196bdd497c73cb3939e9a132f00ca4084220712f46158c92984e9edf9' 
  AND token = 'IdEe9OU59KgSGgACdUy0BshbR0sKtGprJqIByMdHqJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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