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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ebe6f683e092d3a97280f72eaadc34a2a828a11a57cd3d918da340054c8e8d' 
  AND token = 'KABdStAGVoC4PaY/7TZyJfzy3eGMiUwaKmawfFd//8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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