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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7670bc4df874d6782386cbbef788e503c73ab88c2aa904ead0abcefbecf40fd6' 
  AND token = 'hjw66V76IQQ7KhuGVEC8DKK/LQ6pDdJiMmlwH1mpPG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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