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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac254d88b877d74e2c43b0bb68c6613907633d958fc47d65870e95e769cd971f' 
  AND token = 'LDQiIphoJP77SRQgey81Ita6DBMg1SOFzd5Db1D+D7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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