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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2b5216efbbf43aff63bc97f5ceb14d2f26c547bb84cabfb27f9e55aa453b1e' 
  AND token = 'bhZxQ1SQ4jDytVwS7l+0OsD+zFkDuypq1b8kajUZv/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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