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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdbff958343ed4c24b7738bc06be5936fc6ca8f67a8e5211ed74350d9a1d866' 
  AND token = 'T3LpipAvUSNOHbs09viBaOiSgH9XFY0uFaMrR7tDmOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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