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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdda6936f5ea2c7f2a2a9876e1207911323e8a3d6238f97762816bbedb1962c' 
  AND token = 'ub5Z7Y8HxqShpteR21GHjVEmyFlmJMB92qgBHNpLioA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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