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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9149b3e33097eae9bf4d798f7a175d5490c7df2493e2657335805e4371dae0b1' 
  AND token = '+2BWGElFoNCt8Xwn40pPNpkbOe/fGqmADT7k9VafXdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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