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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec9318333d2ae87c2e79605c68e8d1f97807ba016d7ba0c42fd1fc2b9e292c1' 
  AND token = '3N/KkXszv5pUHKABqn4O6nC6XGsH9ugmEGpm0IqXP0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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