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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed95a318a72998497628ec459f50f07902f5a0e3c7a0d106e9aaa94567d6047b' 
  AND token = '+F2NyFSDLjLvdRsBI516E4qVH0pJB8qM5z6Xbff7+9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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