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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4b6add41b65287db8d274ae28430254052b55e1b8f38cfb0355bbd56f4332e' 
  AND token = 'kdk7Fdw6wmIK3PTmGY49FJKABBBqS58CQUJ1fYBuE+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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