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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93385f983570de149aa3a4adecf741185d0c0f1b1ca2e4d563e8a49539850cd' 
  AND token = 'x45w+qrjXt+xixbNA08IYoK4tEMgDiSO7YLuE+DFAOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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