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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cda49660ceab3c31b88c54e05fe26068c86ff1563a16bb63e2434bddaea630' 
  AND token = 'PQueJ9rxj0Q6h1nXx1TZLacQZ6U9WScM+nAvB5qE7QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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