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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4429a42ef3b77e5352b8fa0e2a656c32315ef44885880d093d208917b5b9c619' 
  AND token = 'fSavUFloq6L/X5srY9+yJ7CCSEe9it8WYrdH4PYRPDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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