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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cf1ae460aebd5efb7cc2e6036cf7c145704fa894ac50159b592981c877c04e' 
  AND token = 'gLPOrkqTyV5wMLB3Po3awmVKtcQLTAIz9o5gb+DZUyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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