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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46deadb342b052d3a3b91ad405ff0b3d7fe6f59a61b2fa7177ba62b57e068609' 
  AND token = 'leSA5muJNumLLMB8zq4hLwcn6F6/mGhDUMwMpeME4KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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