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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586ec55e0fd65304257dc59e79d62ebc305fa17b90cc387c4afe600fe13f3ad2' 
  AND token = 'mm4/up75J75v+Lr6LEuVZ6+RPFzyIf7riAJnmbbzLPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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