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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2721ffdeac49718dc1fc3fefd59bd44536497a141a85ecce465d941b57b0a1' 
  AND token = '99rmNatBlUyLXfWWIkX8iB+H6wU5T5dV381G7iHaW98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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