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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090305610beee641a6801abb5d7baf7e0da6b426f271132666853188e0ffa744' 
  AND token = 'zra11YdVMtbHp6e75UmTBFaAaILcIjWxbzJmLc4SzlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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