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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d09816e08230496cd02d06bea81a032fd03b821c717d9b854e77928e6840d48' 
  AND token = 'SSkE1pa45RngYMnbUTUA2xUHBo1EK4K5YKqpeQL8wN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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